Unit 7 Programming Assignment Solution hhjj hzjsj jsjsjsns usjsejjs hfhrkke PDF

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Unit 7 Programming Assignment Solution The quiz questions, answers, and choices for correct answer should be unique for each submission. Here is an example. Files "QuestionDialog.java": import java.awt.event.*; import javax.swing.*; public class QuestionDialog extends JDialog implements ActionListener { String answer; public void actionPerformed(ActionEvent e) { answer = e.getActionCommand(); dispose(); } }

File "Question.java": import java.awt.*; import javax.swing.*; public abstract class Question { static int nQuestions = 0; static int nCorrect = 0; QuestionDialog question; String correctAnswer; Question(String question) { this.question = new QuestionDialog(); this.question.setLayout(new GridLayout(0,1)); this.question.add(new JLabel(" "+question+" ",JLabel.CENTER)); } String ask() { question.setVisible(true); return question.answer;

} void check() { nQuestions++; String answer = ask(); if (answer.equals(correctAnswer)) { JOptionPane.showMessageDialog(null,"Correct!"); nCorrect++; } else { JOptionPane.showMessageDialog(null,"Incorrect. The correct answer is "+correctAnswer+"."); } } void initQuestionDialog() { this.question.setModal(true); this.question.pack(); this.question.setLocationRelativeTo(null); } static void showResults() { JOptionPane.showMessageDialog(null,nCorrect+" correct out of "+nQuestions+" questions"); } }

File "TrueFalseQuestion.java". import javax.swing.*; public class TrueFalseQuestion extends Question { TrueFalseQuestion(String question, String answer) { super(question); JPanel buttons = new JPanel(); addButton(buttons,"TRUE");

addButton(buttons,"FALSE"); this.question.add(buttons); initQuestionDialog(); answer = answer.toUpperCase(); if (answer.equals("T") || answer.equals("TRUE") || answer.equals("Y") || answer.equals("YES")) correctAnswer = "TRUE"; if (answer.equals("F") || answer.equals("FALSE") || answer.equals("N") || answer.equals("NO")) correctAnswer = "FALSE"; } void addButton(JPanel buttons, String label) { JButton button = new JButton(label); button.addActionListener(question); buttons.add(button); } }

File "MultipleChoiceQuestion.java" import java.awt.*; import javax.swing.*; public class MultipleChoiceQuestion extends Question { MultipleChoiceQuestion(String query, String a, String b, String c, String d, String e, String answer) { super(query); addChoice("A",a); addChoice("B",b); addChoice("C",c); addChoice("D",d); addChoice("E",e); initQuestionDialog(); correctAnswer = answer.toUpperCase();

} void addChoice(String name, String label) { JPanel choice = new JPanel(new BorderLayout()); JButton button = new JButton(name); button.addActionListener(question); choice.add(button,BorderLayout.WEST); choice.add(new JLabel(label+" ",JLabel.LEFT),BorderLayout.CENTER); question.add(choice); } }

File "Quiz.java". (This file should not have changed since the previous assignment.) public class Quiz { public static void main(String[] args) { Question question = new TrueFalseQuestion("Quizzes are fun!","y"); question.check(); question = new TrueFalseQuestion("Quizzes are more fun than programming!","n"); question.check(); question = new TrueFalseQuestion("Which one starts with T?","t"); question.check(); question = new TrueFalseQuestion("Which one starts with F?","f"); question.check(); question = new TrueFalseQuestion("Which one is not true?","false"); question.check(); question = new MultipleChoiceQuestion( "What is a quiz?", "a test of knowledge, especially a brief informal test given to students", "42",

"a duck", "to get to the other side", "To be or not to be, that is the question.", "a"); question.check(); question = new MultipleChoiceQuestion("When is a quiz?", "long, long ago", "right now", "the best of times", "the worst of times", "nevermore", "b"); question.check(); question = new MultipleChoiceQuestion("Where is a quiz?", "a galaxy far, far away", "under the sea", "right here", "there and back again", "the other side of the mountain", "c"); question.check(); question = new MultipleChoiceQuestion("Why is a quiz?", "I think, therefore it is.", "Who is to say?", "You tell me.", "Because learning is fun!", "Because I said so.", "d"); question.check(); question = new MultipleChoiceQuestion("How is a quiz?", "fair to middling",

"not bad", "by a stroke of luck", "by accident", "Using Java object-oriented programming!", "e"); question.check(); MultipleChoiceQuestion.showResults(); } }

Screen shot of a true/false question.

Screen shot of a multiple-choice question....